Den 08.12.2023 23:56, skrev Terje J. Hanssen:
Den 08.12.2023 12:50, skrev Andrew Randrianasulu:
пт, 8 дек. 2023 г., 13:57 Andrew Randrianasulu <[email protected]>:
пт, 8 дек. 2023 г., 13:37 Terje J. Hanssen via Cin
<[email protected]>:
Den 03.12.2023 22:29, skrev Terje J. Hanssen:
Already touched this topic barely in another thread
https://lists.cinelerra-gg.org/pipermail/cin/2023-December/007346.html
But so many SW and HW pieces are mentioned around, it is
almost a full-time reading and study:
VAAPI, MESA, VULKAN, Intel Quick Sync Video etc......
I realize my aging hardware which is fast enough for other
tasks, needs some "AV1 upgrade", if possible.
But first I wonder, what is expected possible to do (obtain)
with AV1 de-/encoding on my existing 64bit hardware:
1) laptop 2018: Dell XPS 13-9370: quad core i7-8550U CPU
(8. gen Kabylake) and Intel UHD Graphics
2) WS infinity: MSI Z170A mobo: quad core i7-6700K CPU
(6. gen Skylake), NVIDIA GeForce GT-730 graphics
A budget friendly first "AV1 HW upgrade" of the workstation
2) if possible, would be to add a new GPU as Intel Arc A380.
But the question is if this will work at all on that much
older (2015) Skylake platform with i7-6700K CPU?
I've seen CPU bottlenecks has been mentioned and that Arc
A380 is targeted at newer generations CPU ...
Extracted from the first wikipedia reference below about
Intel Alchemist GPUs:
* Featuring 8 Xe-cores, the*A380 supports PCI Express 4.0*
and has a total board power (TBP) of 75W. The graphics
card is equipped with 6GB GDDR6 memory and a graphics
memory interface of 96 bits, providing a memory bandwidth
of 186GB/s.
* Bus interface A380: PCIe 4.0 x8 and for >=A580:
PCIe 4.0 x16
That is, the keyword here seems to be PCIe 4.0 bus speed as a
requirement to utilize the Arc A380 GPU for HWA AV1 encoding
(maybe also for other GPUs?)
well, despite so much time spend looking at dev process for
mesa3d I still do not know full details and media encoder
process. But isn't it like putting uncompressed frame in vram (as
long as you have enough of it - so probably n raw frames between
keyframe ideally?) let media engine chw on it, pull resulting
compressed bitstream out of vram via pci-express?
So I speculate pcie bandwidth in itself will only matter if you
compress both big frame size and long keyframes, so dma engine on
card must constantly pump new raw frame data via bus.
I saw some mention of big (resizeable) BAR as requirement for
good performance, but opengl/vulkan IMO a bit different because
they send often big amount of tiny objects (vertices) via bus for
each frame. But may be default 256 Mb in size bar feels a bit
small for sending like 1 second of 25 4k frames (300 mb/s)?
Nothing would be better than that A380 does work with older PCIe 3.0
motherboards and CPUs and without too much decrease in performance.
Then I got the following reply to my support request from ASRock TSD
regarding
https://www.asrock.com/Graphics-Card/Intel/Intel%20Arc%20A380%20Challenger%20ITX%206GB%20OC/index.asp
Skylake platform does not match the system minimum requirements.
Please refer to the below link for further information.
https://www.intel.com/content/www/us/en/support/articles/000091128/graphics.html
I've also extracted from the following two articles:
Intel Arc Desktop Graphics Card Gets Requirement List: Resizable
BAR Enabled & Support on 10th Gen and Above CPUs
https://wccftech.com/intel-arc-desktop-graphics-card-gets-requirement-list-resizable-bar-enabled-support-on-10th-gen-and-above-cpus/
/We are supporting Intel platforms with resizable BAR and will add
support for AMD platforms with Smart Access Memory as Intel Arc
graphics cards become available for sale as components.
Motherboard requirement:/
* Full-size PCIe 3.0 (or newer) x16 slot
* Resizeable BAR
Arc A770 Loses Up to 24 Percent Performance Without Resizable Bar
| Tom's Hardware
https://www.tomshardware.com/news/arc-a770-loses-25-percent-performance-without-resizable-bar
* Arc isn't for older systems.
* Intel has revitalized the midrange graphics card market with
the company's latest Arc A770, which will make its way into
the list of best graphics cards. Starting at $329, the Arc
Alchemist graphics card brings GeForce RTX 3060-like
performance to the table with Resizable BAR (ReBAR) enabled,
of course. But, without ReBAR or similar technology like Smart
Access Memory (SAM), it's another story.
* With Arc, Intel recommends potential consumers make sure their
systems support ReBAR or SAM.
* In addition to testing ReBAR, TechPowerUp also evaluated
whether the speed of the expansion slot impacts the Arc A770's
performance. As a reminder, the Arc A770 comes with a
conventional PCIe 4.0 x16 interface. However, the tests
revealed that PCIe 3.0 is still plenty for the Arc A770 as
long as ReBAR is enabled. Furthermore, TechPowerUp only
recorded a performance difference of up to 2% between PCIe 3.0
and PCIe 4.0, so ReBAR support is more important than the
expansion slot. Regarding ReBAR, only Intel 10th Generation
Comet Lake
<https://www.tomshardware.com/news/intel-comet-lake-s-cores-53-ghz-high-power-better-pricing>,
11th Generation Rocket Lake
<https://www.tomshardware.com/news/intel-11th-gen-rocket-lake-s-specifications-pricing>,
and 12th Generation Alder Lake
<https://www.tomshardware.com/features/intel-shares-alder-lake-pricing-specs-and-gaming-performance>
processors support that feature. As for AMD, SAM support is
only present on Ryzen 3000
<https://www.tomshardware.com/news/amd-third-gen-ryzen-7nm-launch-intel-cpu,39449.html>
Zen 2 chips and newer. So while Arc's performance looks
attractive and priced fairly, its requirements effectively
lock out users with older systems. Arc also demands Windows 10
20H2 or Windows 11
<https://www.tomshardware.com/tag/windows-11> as the operating
system, so Windows 7 users, who are reluctant to upgrade, are
also out of the picture.
https://forums.gentoo.org/viewtopic-t-1165048.html?sid=1b9518b86afdcd1fa5e7710f16cd6893
not exactly about av1 in ffmpeg 6.1 but lists some components you
need for vaapi/qsv encoder on Arc 380 - also from dmesg resizeable
bar support is not essential ?
gpus today use their own memory paging system, so may be this add
additional restriction on how fast you can push frames to them. ....
Also, windows and Linux drivers might differ ( I bet most reviews
are from windows land).
May be someone will post linux review of this particular aspect
of Arc graphics, either video or text ...
If this Suse Studio service still works may be you can compose
your own live image with all components required to test that and
walk to some offline place where you can testdrive new card ....
{ If weather feels favourable enough - we have around -14 C
airtemp so I and my dog prefer short dashes around and back to
warm place shortly}
My existing Skylake WS 2) above has PCie 3.0 only.
PCIe 4.0
https://no.wikipedia.org/wiki/PCI_Express
https://www.techreviewer.com/learn-about-tech/what-is-pcie-40/
Motherboards Support PCIe 4.0
https://www.makeuseof.com/best-budget-pcie-4-motherboards/
https://www.techreviewer.com/tech-answers/which-motherboards-support-pcie-40/
Maybe also information of interest for WS building will be
clarified within a week, when Intel release their new "Meteor
Lake, Core Ultra mobile processors(?)
https://en.wikipedia.org/wiki/Meteor_Lake
References:
AV1 Encoding on a Budget: The Intel Arc A380 Approach
https://medium.com/@contact_45426/av1-encoding-on-a-budget-the-intel-arc-a380-approach-d72367f2f349
https://history-computer.com/intel-arc-a380-full-review-of-intels-entry-level-gpu/
AV1 fixed-function hardware encoder is included in Alchemist
GPUs as part of the Intel Quick Sync Video core.
https://en.wikipedia.org/wiki/Intel_Arc#Alchemist
https://en.wikipedia.org/wiki/AV1#Hardware
https://en.wikipedia.org/wiki/Intel_Quick_Sync_Video#Hardware_decoding_and_encoding
--
Cin mailing list
[email protected]
https://lists.cinelerra-gg.org/mailman/listinfo/cin
--
Cin mailing list
[email protected]
https://lists.cinelerra-gg.org/mailman/listinfo/cin
